Centrifugal machine.



A R. ROBERTSON.

' GBNTRIPUGAL MACHINE.

APPLICATION FILED MAY 8, 1914 Patented Jan, 12, 1915.

ZISHEETS-SHEET 1.

A. R. ROBERTSON. GBNTRIPUGAL MACHINE.

AP/FLIUATION FILED MAY 8, 1914.

l,12480'7.`5` Patented .11111.12, 1915.

2 SHEETS-SHEET 2.

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ANDREW ROBERT ROBERTSON, oF'KIN'GsToN, GLAsGoW, soortann.

CENTRIFUGAL MACHINE.

meteor,

To all whom it' may concern Be it known that l, ANDREW ROBERT ROB- nn'rsox, a subject of the King ot Great Britain and lreland, and a resident of Kingstou, in the city and county of Glasgow, Scotland, have invented certain' new and useful Improvements in Centrifugal Machines, of which the following is the speciication.

This invention relates to centrifugal machines principally intended for use in drying sugar or other granular materials, and of tne type in which the discharge ot' the dried contents. of the basket is assisted by a mechanical plow or scoop device; and has for its object to provide an improved construction ot' such device, and improved means for operating same, such that -after the material is dried the scoop is brought into action to insure the removal of the lowermost portion of the material throughv the usual central discharge opening in the basket. On the removal of this portion, gravity causes the then unsupported remainder of the material to. be treed from the sides of the basket, and the scoop then also further acts to insure the complete discharge of the material.

Acording to the invention, the improved scoop vdevice consists of a paddle or series thereof extending out to near the inner cir-` cumference of the basket from a central hub part on the lower endv of a sleeve free to rotate on the basket spindle. The under sides of the paddles are so contoured that they rest on the bottom of the basket, sothat this frictional contact causes the paddles to rotate with the basket when the latter is in motion. Braking means are provided, so that when the vbasket is to be discharged, the rotation of the sleeve and paddles is arrested before the basket comes to' rest. Owing to the relatively slower movement of the paddles thus produced, they eut away and discharge the lower portion of the dried material, and the basket is finally emptied as hereinbefore described. lf desired., the braking means may be made to also act in such a manner as to assist in stopping the rotation of the basket, and if the basket is brought to rest before the material is finally discharged, the braking means may be so far Withdrawn that While the sleeve and paddles continue to be held, power may be again applied to the basket spindle and the basket again rotated', thus Specification of Letters Patent. V Patemid JML 12, 1915,

Application led May 8, 1914. Serial No. 837,306.

form, but preferably they are so curved that those faces which move against the contents of the basket are concave, and stay rods extend between the hub and the outer s ends of the paddles to prevent them tending to straighten themselves under the pressure ol centrifugal action. The hub valso carries a distributing plate on to which the material is fed and from which it is thrown against the basket by centrifugal torce.

The improved construction oit'scoop and means of operating the same may With advantage be used in a basketthe ,shell of which is conical as described in the specification filed vwith my concurrent application for a patent, since'it is obvious thatif the lower part of the sugar Wall is removed by the scoop, the conical shell of the basket will assist gravity in causing the ywall of sugar to fall down.

An example of the -improved construction j,

accompanying sheet of explanatory drawings. i

s shown in the drawings, the improved scoop device consists of paddles B extending out to near the inner circumference oi the basket C from a central hub 4l) on the Alovver end of a sleeve E free to rotate on the basket spindle F. The under sides of the paddles are so contoured that they rest on the bottom G of the basket C, so that this frictional contact causes the paddles to rotate with the basket when the latter is in motion. The paddles are so curved that those faces Which move against the contents of the basket are concave, and stay rods H extend between the hub D and the outer ends of the paddles B to prevent them tending to straighten themselves under the pressure of centrifugal action.

The braking device consists et two spherically surfaced brake drums, one d being car -ried by the basketvspindle l?, and the other ttt) ofthe bote N and ere slowing down and finally Stopp "'-tlon of the basket arms 0, these bolts pssslsg; thsoogb Rigs? formed'on the broke nog L, the oorlogs ectino between eosting nuts Q, on the.

O LD

bolts and the lower ings. @om evers R wie provlded for operating the s' L.

d These levees E ere pwo'te. on the lower ends Connects/ togetbe 'oy when the evets f1 1 n ;.A U, ed bowel.

serbed. The bob D esres e, distributing plete T on to which tbe materiel is en from which it is thrown against C by centrifugal ox'oe.

'What Chaim is l l. E11 s centrifugal melebne, e scoop oevise Within and rotating' with the basket,

sod means o retsldog the scoop devies so basket, and means for Controlling the ro A tlonoit the vscoop dence relatsey to that it moves restvely to the basket to dis-- .ehage the. contents thereof.

2. 1n a centrifugal mech' e, scoop de- .vee comprising a, sleeve surouong the usua basket spindle, s. hub on the ower emi of the sleeve, `paddles carried by .the bob7 the under side of the psddlesbeog so oootoured that they VTest oro the bottom of the of the beslist.

` 3. ln e centrifugal meobne, e roundl-ngthe usuel et spindle, s

thexgeooypsddles so carried by. the

Mesem they rest on .tbe bottom of the boei/ies, tee

pedoles being so 'ourvect that those feces Wbaoo move against the contents of to boeket. V

L e centrifugal meebine, e seeve rounding the usuel basket spode, e 1bereon7 pses so earredby tbehubtbot hey rest on the bottom of the basket, two essere drums7 one on the basket shaft en@ og-be exterox thereto and eerzaec on s1y eve, s spring oontolled brake sing es telor to the outer brake drulri, and fol' operating the broke ring as desobe.

5. In a centrifugal machine, o seeve sur-- rozmdog the usuel basket spindle7 e bob thereooy peefcies so carried by the bob 'es, on the bottom of the basket, two bwke drums, one on the basket shaft' tbe other exteor thereto and carried on the sie-eve, a bieke ding exterior to the outer brake (bium, bolts carrying the brellre'xeg, sprsogs on the bolts normsiy holding the booke ro out of contact with the outs? drum? sod com levers mlerumed on tbe, bote to operate the brake ring ogenst' the semen-o the sprmgs.

testimony whereof have, signed my saone to thls speeloetloo, 1n the presence of two subsolbmg Witnesses.

ANEREW ROBERT EOEBJSGN A Umso HUN T, Jer/ms EAGLESOM. 

